Turbo-like Codes: Design for High Speed Decoding by Aliazam Abbasfar
By Aliazam Abbasfar
This ebook introduces faster errors correcting proposal in an easy language, together with a normal conception and the algorithms for deciphering turbo-like code. It provides a unified framework for the layout and research of rapid codes and LDPC codes and their deciphering algorithms. an immense concentration is on excessive velocity faster deciphering, which goals purposes with information premiums of numerous hundred million bits in keeping with moment (Mbps).
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Example text
Simulation results demonstrate that this structure not only achieves some orders of magnitude in speed gain, but also maintains the efficiency in processing. Also we have shown that the efficiency and the speed gain of this architecture are almost independent of the SNR. We also have proposed a novel interleaver structure for parallel turbo decoder. The advantages of this architecture are low latency, high speed, and the feasibility of the implementation. Simulation results show that we can achieve very good BER performance by this architecture as well.
Although this structure is applicable for every turbo code, we will explain it in the case of a block PCCC code. 1 Low Latency Interleaver Structure To explain the interleaver structure we start with the reverse interleaver in a serial decoder. When the reverse interleaver is used, it is observed that the next iteration can start processing as soon as the first extrinsic is ready and every new computed extrinsic is used right away. This property is true only for the reverse interleaver. The reason for this property is that the sequence of extrinsics computed in the current iterations matches the sequence needed in the backward recursion in the next iteration.
SISOM : Backward: Forward: Output: y N −1 y N −2 . . y1 y0 b N b N −1 . . b2 b1 b0 y0 y1 . . y N −2 y N −1 a0 a1 . . a N −2 a N −1 a N x0 x1 . . x N −2 x N −1 y2N −1 y2N −2 . . y N +1 y N B2N b2N −1 . . b N +2 b N +1 b N y N y N +1 . . a N a N +1 . . x N x N +1 . . y2N −2 y2N −1 a2N −2 a2N −1 a2N x2N −2 x2N −1 y M N −1 y M N −2 . . y(M−1)N +1 y(M− 1)N b M N b M N −1 . . b(M−1)N +2 b(M−1)N +1 b(M−1)N y(M−1)N y(M−1)N +1 . . y M N −2 y M N −1 a(M−1)N a(M−1)N +1 . . a M N −2 a M N −1 a N x(M−1)N x(M−1)N +1 .